Work feeding mechanism



Feb. 27, 1940. M. H. ARMs Er Al.

WORK FEEDING MECHANISM Filed Jan. 28, 1958 5 Sheets-Sheet 1 M 5,1, www5@m W w j.

Ilr VIIMw, Vf w @C Fveb.` 27, 1940. M. H. ARMs E'r AL WO'RK FEEDINGMECHANISM 5 Sheets-Sheet 2 Filed Jan. 28, 1938 IIIIAIIIJN Feb. 27,1940.r yM H, ARMS ET AL 2,191,930

WORK FEEDING MECHANISM Filed Jan. 28, 193B 5 Sheets-Sheet 5 Feb. 27,1940. M. H. ARMS ET AL WORK FEEDING MECHANISM Filed Jan. 28, 1958 5Sheets-Sheet 4 NS IMJ l l n llfM -IILVII Feb- 27, 1940- M. H. ARMs E1-AL WORK FEEDING MECHANISM Filed Jan. 28, 193B 5 Sheets-Sheet 5 f Q @Q NSw Q E Q Mw LJ@ Q QS www s m f 1,1 4 NN M W N Q Q NQ .MJ f, MMMW, @m2 ,w

`Patented Feb. 27, 1940 UNITED STATES PATENT 'l OFFICE WORK FEEDINGMEcHANisM Application January 28, 1938, Serial No. 187,462

24 Claims.

This invention relates. to the feeding of work to be operated upon andmore particularly to the feeding of individual work pieces, and has foran object to provide means for the feeding of such pieces through ahollow spindle and into achuck adapted to, grip the work pieces as theyare fed intov it land to` release them after the desired work has beendone thereon.

The invention fur-ther relates to a chuck construction especiallydesigned for cooperation with the work feeding means.

For a ymore complete understanding of this invention, reference may behad -to `the accompanying ydrawings in which Figure 1 is a fragmentaryView partly in side elevation `and partly in section of an internalgrindingy machine illustrating one embodiment of this invention.

Figure 2 is a left end elevation of a portion of the mechanism shown inFigure l.

Figures 3 and 4 is a section to a larger scale on line 3 3 of Figure 2,Figure 4 showing the chuck.

Figure 5 is a section to a larger scale on line 5--5 of Figure 1.

Figure 6 is a section on line 6--6 of Figure 3.

Figure 7 is a perspective View of the Work-engaging portion of the feedmechanism.

Figure 8 is a fragmentary perspective View of the stock tube.

Figure 9 is a front elevation of the chuck.`

Figure. 10 is a view similar to Figure 4, but showing a modifiedconstruction.

Figure 11 is a front end elevation of the mechanism shown in Figure 10.`

Figure 12 is a view similar to Figure 3, but showing the modifiedconstruction of Figures 10 and 11.

Figure 13 is a fragmentary side elevation of an internal grinderprovided with the work feeding mechanism of Figures 10 to 12.

Figure 14 is a detail section on line I4I4 of Figure 13.

Figure 15 is a view similar to Figure 4, but illustrating a modifiedconstruction and showing the chuck closed.

Figure 16 is a view similar to showing the chuck open'.

Figure 17 is a section on line ure 15.

50 Figure 18 is a fragmentary perspective view of the feed bars used inthe construction of Figures 15 to 17, inclusive.

Referring Ifirst to the construction shown in Figures 1 vto 9,inc1usive,at I is indicated a hollow 55 work spindle, which is journaled inbearings at 2 sie Figure 15, .but

`11-11 of Figin a portion 3 of the machine. The spindle may be rotatedby any suitable means, as, for example, by .a belt 4 passing about apulley 5 keyed to the spindle, and, as shown,provided with a brakel drumextension 6 for receiving a brake shoe I by *5; whichv the rotation ofthe spindle may be stopped quickly when desired. The spindle I carriesat one end a chuck I0. This chuck has a tapered internal face Il withwhich cooperate jaws lI2 having work-engaging blocks I3. These jawsI2are carried at the outer ends of spring fingers I4 projecting from theforward end of a sleeve ,I5 axially slidable within the spindle I sothat as the sleeve I5 is moved to the left, as viewed in Figure 4, theclamping blocks I3 are brought toward the axis of the spindle, thus tofirmly clamp the work. By moving the sleeve to the right the blocks I3spring outwardly and release the work. The sleeve I5 has attached to itsfree end shoes, such as IGa, which are positioned to guide the Work inbetween the clamping jaws I 3 so that work pieces may be fed into thechuck from within the hollow spindle. o

The Work consists of individual pieces as W, which are slidable within atube 20, which,l,vas shown best in Figure 8, may comprise a pair of yinner and outer sleeves 2| and 23. v`The inner sleeve 2l is slotted, asat 24 (see Figure 8) and within these slots ride feedbars 25 which areshown detached in Figure 7. Each of these bars is provided with a seriesof spring stock-engaging fingers 2B which are secured to the bars atintervals, with free ends, as 21, projecting inwardly toward the axis ofthe spindle and positioned to engage between successive spaced apartwork pieces W within the inner sleeve 2|, as shown in Figure 3. Theouter sleeve 23 is continuous and holds the bars 25 from outwardmovement; At their rear ends the bars 25 are secured to aftub-u'- larIactuating part 28 which has a closed end 29in which is secured, as by anut 30, the'forward end of a work feeding plunger 3i. This plungerextends into a fluid pressure cylinder 32 where there is xed thereto apiston 33 slidable within the cylinder. The member 28 is provided with aforward extending portion of reduced diameter, as at 34, which mayengage the rear end of the last work piece W within the tube120. `Itwillr be noted that the member 28 with the feed bars 25 is slidableWithin the inner sleeve 2|. 1 y

The heads 40 and 4I for the cylinder 37,2r are provided with fluidpressure ports 42 and 43, respectively, with which communicate fluidpressure pipes 44 and 45 by which fiuid under pressure may be admitted.or exhausted to cause reciprocation of the piston 33 and the workfeeding fingers 25 to feed the work pieces forwardly within the tube 2Uon each inward movement, these work pieces being spaced apart as shown.The inner sleeve 2| is shown as provided with spring fingers 4E havingfree ends 41 projecting inwardly, yet yieldable to permit the stockpieces W -to be fed therepast toward the chuck, and springing backbehind each work piece as it passes by and preventing return movement ofthe Work pieces during the retraction of the feed bars 25.

The heads 4Iland 4I of the cylinder 32 are secured together and to astationary member 5I! within which the rear end of the tube 2l) extends,as by bolts 5I, and this member 50, as shown best in Figure 5, isprovided with a pair of flanges 53 to which may be secured a flange 54of a work-holding upwardly inclined chute 55. The work pieces, which areshown as ring members, may be fed into the upper end of the chute 55from which they may fall through a slot into the rear end portion of thetube 2!) into the position shown in Figure 3 .directly in front of thefeeding member 28 by which they may be fed forward into the tube 2i). Asshown herein, the tube 2G is non-rotatable, being secured to the member59, its forward end extending into the spindle I and opening adjacent tothe back of the chuck Ill, the sleeve I5 being journaled thereon throughan interposed rubber sleeve 55. Fluid under pressure is supplied andexhausted with reference to the opposite ends of the cylinder 32 throughthe pipes 44 and 45 by means of a valve 65 (see Figure l) the stem 6I ofwhich is provided with the heads 32 and 53 and whose outer end carries acam roller 64 for cooperation with a cam 65 secured to a shaft 5B. Thefollower roll 64 is held up against its cam as by means of a spring 650bearing against the inner end of the valve stem 6I. Fluid under pressureis supplied to the Valve through the pipe I'I and is dischargedtherefrom through a pipe 68. In the position shown in Figure l, fluidunder pressure is admitted from the inlet pipe El past the head 63 andinto the pipe 45 so as to hold the piston 33 in its retracted position,but when the high spot 69 of the cam 65 contacts with the follower roll64, the valve stem is moved to its opposite position where fluid underpressure is'supplied to the pipe 44 and discharged from the pipe 45,thus causing the piston with the feed fingers to be moved in feedingdirection.

It will, of course, be necessary that the chuck be open when the feedaction takes place in order that the work piece next adjacent tothechuck may be fed thereinto. This is accomplished, as shown, by the axialmotion of a spool I normally spring pressed to its left hand position bythe coil spring 7| bearing against its right hand end and against theadjacent end of the spindle I. 'Ihis spool 'ID is secured as by its ange'I2 threaded thereon to the rear end of the-chuck sleeve I5, and whileit rotates with the spindle, it may be moved axially by means of a fork'I5 having shoes Iwhich may be engaged back of the spool flange TI.Rocking of the fork 'I5 in clockwise direction, asviewed in Figure l,causes the sleeve I to be pushed forwardly, thus releasing the clampingjaws I3 and permitting the stock piece next to the chuck to be pushedthereinto, this, in turn shoving out at the forward end the piecepreviously in position within the chuck.

The work piece, which is moved into the chuck, passes by stop member 80,one of which is shown in Figure 4. Each member 80 ispivoted, asat 8l, tothe chuck member ID and is normally spring pressed by the spring 82 intoposition f with its inner rear end engaging with the chuck body at a andback of the rear face of the work piece W Within the chuck, but it maybe depressed by the engagement of the work piece W on its rearwardinclined face 83 so as to permit the work piece to pass freelytherepast. As soon as the work piece passes beyond it, it is pushed intostopping position by its spring' 82. On the subsequent rearward motionof the sleeve I5 to close the chuck the work which has just-been fedthereinto is clamped in position by the jaws I2 carrying the blocks I3after it has been pushedv back against the stops 8U by spring fingers 86on the clamping jaws 85. These jaws 35 are fulcrumed as at 81 on `theforward end of the sleeve I5 and are normally urged `outwardly as 4bysprings B8 reacting between them and lthe end portion of the sleeve .I5.with inclined faces 39 cooperating with inclined faces 90 on the chuckI0 so that` as `the 'sleeve l I5 is drawn backwardlyfto close the chuck,the fingers 85 are closed. The extent ofthe pressure of the springfingers 86 against the forward face :alsl

of the work piece may be adjusted as by means i of the screws SI whichextend throughholes in the spring ngers Stand are threaded intothemembers 85. When the chuck opens, these ngers 86 are removed from theirnormal positions in which they would prevent the discharge of work from4the chuck. r f

The actuation of the fork I5 to yfree thework or to permit the spring IIt0 clamp'the work is produced by a cam 95, alsoA carriedbythe' shaft 65and which is provided with a hump 97. When this hump engages the camfollower roll 98 journaled on the arm 99 of thev fork "I5, this fork'isswung about its pivot III() in a; direction i to release the chuck,whereuponthe shift` of the valve stem 6I is keffected to accomplish thefeed of the stock. I

In Figure 1 the grinding wheel IUE for operat ing on the work pieceswhich are successively' presented into the chuck is illustrated, thisgrinding wheel being driven by any suitable means (not shown).

Another feature of the present invention is the introduction of coolantto the work piece as it f is being operated upon, through the hollowspindle. For this purpose the sleeve 2l is shown as provided withlongitudinal grooves I II) in its out- Y er face which lead to ports III(see Figure 4) passing therethrough adjacent to the forward end of thesleeve. These grooves IIIB'are closed off on their outer faces by thesleeve 23 so that coolant passages are formed through the tube 2l]comprising the sleeves 2l and 23 andthe sleeve 23 is provided with holesII2 therethrough coinmunicating with the rearV end portions ofthegrooves III) as shown in Figures Sand 6. The member is also providedwith an annular internal groove H3 with whichv the openings H2`register, this passage II3 being extendedon one..

side to form the bore of an inlet pipe I I4 through which coolant may beintroduced, as through the supply pipe H5 shown in Figure 1. Y

In Figures l0 to 14 a modiflcationis shown n which the Work pieces arefed to the chuck in 'contacting relationship with each other, instead ofin spaced relationship as in the construction. previously described. Inthis modification the work pieces W are fed through lthe sleeve I30,which is provided with longitudinal external They are provided v,in themechanism previouslydescribed, vhaving the chute |31 through which stockmay be supplied through a slot |38 4(see FigurelZ) into alinement withthe work pieces within the sleeve |30.

Within this member |35` they are contacted by the feeding plunger |40actuated by the piston|4| y inthe uid pressure cylinder |42.

by lthreading to the sleeve |30. This spool |80 The feed bars |3|havesecuredthereto at their foi-ward ends-resilient feed fingers '|45(see Figure which extendthrough slots |43 of the sleeve or. tube |30 andengage only the last work piece back ofthe chuck |48. This chuck |48 issomewhat similar to the chuck I0 ypreviously described. It is providedwith guide fingers y|50 between which `the work piece maybe guided andsupported while in the chuck, and the work pieces` are fed into thechuck successively past the stop dogs |52. Each stop dog is pivoted asat |53 and is spring pressed against a stop |54 as vicy-means of a`spring |55.v `When resting against the' stop |54 a portion |56 of eachdog extends in between the work piece in the chuck,H

and the next work piece to be fed thereinto. In this position, also,clamping dogs such as |60 pivoted at |8| have their inner ends at |62-pressed against the. forward face of the work piece thenin the chuck asby engagement of the blocks |64 against portions |65 of these clampdogs.y These clamp dogs are secured to the extensions |66 ofthe sleeve|30 and this sleeve is `arranged to bev pulled rearwardly to bring thedogsv |60 down into locking position and to pull them back against theforward face of the work piece. On inward motionof the sleeve |30, the

portion |65 of each -o-f the locking dogs may ridefoutwardly. acrossaninclined face |61 of lthe block |54, thus permitting these dogs torelease the Work under the action of their releasing vsprings |158...lThe sleeve |30 may be reciprocated 'tothus clamp cr release lthe work..

and close the chuck by motion of a spool |80 having its rear ange member`|8| secured as 'is Y. normally held retracted to hold the work clampedby the chuck and held back against the dogs |56bymeans of a spring |82(see Figures 12y and 13) and it is moved inwardly to release the workfrom the chuck so that a succeeding workl piece may be fed thereinto andthe work piece in position dischargedfrom the chuck by the feedingmotion of the feed bars |31. This is done by the .rocking of a fork |83having shoes |84 which may be `engaged with the spool flange |85.

.This fork |83 is fulcrumed at |86 and its arm |81 carries acamlfollower roll |88 which rides on the edge cam |89. The two cams and|89 are carried bythe shaftV |90 whichcarries a third edge cam |81Awhich actuates the valve plunger 6| of the valve 60, 'as heretoforedescribed, to produce the fluid pressure feeding action f the workpieces within the sleeve or tube |30. Thus, after the chuck has lbeenopened the feed fingers |45 are actuated to feed the last work piece intube |30 into the chuck, dislodgingthe work piece previously therein,the dogs |56 yielding to permit the passage of the work pieces in thisdirection. This feeding motion of `the fingers |45' eff ects only thelast Work piece in the sleeve |30 and spaces it from the next work piecesufficient to permit Vthe dogs |56 to spring in between. Thereafter theclosing movement of the `chuck clamps the work piece therein against thestop dogs |56 in the position shown in Figure 10.`

In Figures 15 to 18 is shown a further modification in which the workpieces vare fed spaced apart, as in the structure shown in Figures 1 to9, but in this modified construction no stops such as 80 of Figure 4 areemployed. The work feed bars such as 25a are each extended and providedwith a spring 200 forwardly of their feed fingers 25. These springs mayride in grooves in the inner faces of the shoes |6a carried by thesleeve |5, as shown in Figure 15, when the work is in fed position, andthey may be retracted to engage the next work piece as shown in Figure16 ready for a succeeding feeding motion of the bars ct. In the latterposition of the parts the sleeve I5 has been moved forwardly to permitthe jaws 85 to be released from the work by the springs 88. A succeedingfeed motion of the bars 25a then pushes the next piece to bernachinedinto the chuck, pushing out the finished piece, and then instead ofretracting all the way they will be retracted only sufliciently for thesprings 200 to retract the work piece in the chuck enough for the jaws85 and the fingers 86 to swing in without the fingers striking on theperiphery rather than on the outer end of the Work piece in the chuck.The work piece is then held between the jaws and the ends of the forwardfeed fingers 26 as shown in Figure 15, the feed fingers then acting-.asstops in place of the stops 80 of Figure 4, and preferably remaining in.stopped position and pressing the work piece forwardly by fluid'pressure exerted on the feed piston 33 during the operations on thework piece held in the chuck. Thereafter the feed bars are retracted tothe positions shown in Figure 16 preparatory to the succeeding feedingaction. The cam for controlling the fluid pressure valve 60 will, ofcourse, be modiiied in contour to produce this different cycle ofmotions of the feed bars.

From the foregoing description of certain embodiments o f thisinvention, it should be evident to those skilled in the art that variousfurther changes and modifications may be made without departing from thespirit or scope of this-invention as defined by the appended claims.

We claim: y

1. In combination, a hollow spindle, a lchuck at oneend of said spindle,means within said spindle for feeding individual work pieces throughsleeve having longitudinally arranged slots therein, work-feeding barsslidable in said slots, workengaging ngers carried by saidbars forengaging work pieces within said tube, means to open and close saidchuck, and means actuated in time with said opening and closing meansforreciprocating said bars to feed work pieces through said tube into saidchuck.

3. In combination, a rotary spindle, a stationary ktube within saidspindle comprising a pair of concentric sleeves, a chuck carried at oneend into said chuck, said sleeves also forming'between them one or morepassages for coolant to be delivered to a Work piece held by said chuck.

v4. In combination, a rotary spindle, a stationary tube within saidspindle comprising a sleeve, a chuck carried at one end of saidspindle,said sleeve having longitudinally arranged slots tlerein, work-feedingbars slidable in said slots, workengaging spring fingers carried by saidbars for engaging work pieces within said tube for feeding said workpieces by reciprocation of said bars, means for preventing backwardmotion of said work pieces when said bars are retracted, means to openand close said chuck, and means actuated in time with said lopening and`closing means reciprocating said bars to feed work pieces through saidtube into said chuck.

5. In combination, a rotary hollow spindle, a tube within said spindle,a chuck carried by said spindle and having work-gripping jaws, and meanspreventing the discharge of work from said chuck, said tube beingpositioned at the entrance to said chuck, means for feeding work piecesone by one within said tube toward said chuck, and means for openingsaid jaws and releasing said preventing means to cause the feeding ofsaid pieces scccessively into said chuck to discharge from said chuckthe piece previously fed thereinto, and for positioning said preventingmeans and closing said jaws to grip the work piece last fed into saidchuck.

6. In combination, a rotary hollow spindle, a stationary tube withinsaid spindle, a chuckl carried by said spindle and having work-grippingjaws, and means preventing the discharge of work from said chuck, saidtube being positioned at the entrance tosaid chuck, means for feedingwork pieces one by one within said tube toward said chuck, and means foropening said jaws and releasing said preventing means to cause thefeeding of said pieces successively into saidchuck to discharge fromsaid chuck the piece previously fed thereinto, and for positioning saidpreventing means and closing said jaws to grip the work piece last fedinto said chuck.

7. In combination, a rotary hollow spindle, a stationary tube withinsaid spindle, a chuck carried by said spindle and having work-grippingjaws, and means preventing the discharge of work from said chuck, saidtube being positioned at the entrance to said chuck, means for feedingwork pieces one by one within said tube toward said chuck, a sleevebetween said tube and spindle movable axially for opening said jaws andreleasing said preventing means to cause the feeding of such piecessuccessively into said chuck to cause discharge from said chuck yof thepiece previously fed thereinto, and for closing said jaws andpositioning said preventing means to grip the work piece last fed intosaid chuck, and

means for moving said sleeve and said feeding means in proper timedrelation.

' 8. In combination,l a hollow spindle, a chuck on said spindle, meansmovable axially of said spindle for opening and' closing said chuck, uidpressure actuated means for feeding articles successively through said.spindle into and then through said chuck lwhile said chuck is open, a

valve for controlling said feeding means, a rotary 1 shaft, and meansactuated by the rotationMOfr said shaft for actuating said opening andclosingl means and for controlling said valve.

9. In combination, a hollow spindle, ay cluck `A carried by saidspindle, a tube within said spindle ,y

and having longitudinal guide grooves therein, bars slidable in saidgrooves, work-engaging fingers carried. by said bars for engaginganfdmoving` work pieces in said tube axiallyk thereof and into said chuck,chuck-opening and closing means, and means for actuating said openingand closing `means and saidbars in proper timed` relation. l

l0. In combinatioma hollow rotary spindla'a chuck carriedby saidspindle, La stationarytube within said spindle and having longitudinalvguide grooves therein, bars slidable in said` grooves, work-engagingiingerswcarried by vsaid bars for engaging and moving work pieces insaid -tube axially thereof and into said chuck, chuckopening. andclosing means, and means for'actuating said opening and closing meansand saidv bars in proper timed relation.

fat

il. In combination, a chuck, stop meansnor- I maliy limiting one extentof motion axiallyof said chuck of a work piece carried thereby, means ton feed work pieces successively into said chuck, means for engagementwith said work piece so fed in position to hold saidk work pieceagainstpieces into said chuck therepast.

' said stop means, and means for mountil'igsaidV f f stop means to yieldto permit the passage of work cessive spaced relation through saidspindle and j into said chuck while said chuck is open, a stockv stop,and means for interposing said stop inthe' space between a work piece insaid chuckand the next following work piece in each feeding action. l

13. In combination, a vhollow spindle, 'al chuck on said spindle, meansfor opening and closing cessive spaced relation through said spindle.vand said spindle after 50 said chuck, means for feeding work pieces insuc- 'l1' into said chuck while said chuck is open, a stock stop, meansfor interposing said stop in the space between a work piece in saidchuck and the next 55 following work piece in said spindle after eachfeeding action, and means for clamping the Work piece against said stop.

14. In combination, a hollow spindle, a vchuck on said spindle, meansfor opening'and closing said chuck, means for vfeeding work pieces inlabutting'relation step by step throughsaid spindie toward said chuck,means for advancing the work piece adjacent to said chuck an amount.. ff

greater than the extent of said stepby step feed into said chuck whensaid chuck is open to space said piece from the ,next adjacent piece, astop, l l and means for interposing said stop in said space after eachfeeding action.

l5, In combination, a hollow spindle, a chuck .y

on said spindle, means for'opening. `and closing said chuck, means forfeeding work pieces in u abutting relation step by step through saidspindle toward said chuck, means for advancing the work lpiece adjacentto said chuck an vamountAIV means for feeding work pieces step by stepand in contact with each otherl through said tubev toward said "chuck,and means engaging each work piece on its emergence fro-m said portionand feeding it by a further amount into said chuck.

17. In combination, a hollow spindle, a chuck carried by said spindle, atube within said spindle having one end portion positioned adjacent tosaid chuck, means to open and close said chuck, means for feeding workpieces step by ste-p and in contact with each other through said tubertoward said chuck, a member positioned within said spindle and .outsideof said tubeand having means for engagement with a work piece on itsemergence from said portion, and means acting v while said chuck is openand after each step by step feeding movementl of work' pieces withinsaid tube to actuate said member to move the work piece projecting fromsaid portion into said chuck.

18. In combinatiom `a chuck having workclamping jaws and stop means` forlimiting the axialv motion of work backward in `said chuck, and meansactuable yto feed in an individual work piece from. the back of saidchuck and to hold said work piece against said. stop means.

19. In combination, a chuck `having workclamping jaws and spring stopfingers4 carried by said jaws for yengagement with the front end face ofa work piece held by said chuckand means actuable to feed a work pieceinto said chuck from the back andto` hold it against said stop fingers.

20. In combination, a chuck havlngan internal tapered face, a pluralityof' work-engaging jaws ,engaging said face and movable axially of saidchuck to grip .and release the work therebetween, saidjaws havingiingers positioned to engage on the forward face of a work piece carriedby said jaws, and means `actuable to feed work pieces thrust. l,

successively into the back of said chuck while said jaws'are open,discharging the work piece previously in position, said feeding meanspresenting stop portions to a workpiece fed into said chuckagainst whichsaid piece is pressed vby said fingers as said jaws'are moved axially ofsaid chuck into work-gripping positions.

2l. In combination, a hollow spindle, a chuck at one endfof saidspindle, means for feeding a plurality of work pieces in said spindlesimultaneously toward said chuck and that one'nextback of said chuckinto said chuck in spaced relation to the next following work piece insaid spindle, means for opening and closing said chuck in timed relationto the .feeding of said work pieces vvand means engageable with the backface of the work piece in saidchuck for holding said work piece againstbackward movement.

22. In combination, a hollow spindle, a chuck at one end ofv saidspindle, means for feeding a plurality of .work pieces in said spindlesimultaneously toward said chuck and that one nextv back of said chuckinto said chuck in spaced relation tothe next following work piece insaid spindle,rmeans for opening and closing said chuck in timed relationto the feeding of said work pieces, yand a work stop moving into and outof position back of theY work piece in said chuck in said space.

23. -In combination, a hollow spindle, a chuck at one end of saidspindle, means having parts engageable 'with each of such work piecesfor feeding each of a plurality of work pieces spaced apart relationthrough said spindle and the adjacent one in said spindle into saidchuck, and means for opening andclosing said chuck in timed relation tothe feeding of work pieces.

24. In combination, a hollow spindle, a chuckl at one end of saidspindle, means for feeding `each of a plurality of work pieces in spacedrelation through said spindle and the adjacent one in said spindle intosaid chuck, means for Openingv and closing said chuck in timed relationto the feeding of said work pieces, and means engageable with the backface of the work piece in said chuckr for holding it `against backward yMERTON H. ARMS. JOSEPH B. JOHNSON. ALBERT TURNER.

